Lang was sleeping in sickbay during a deuterium supply shortage in 2374. Tuvok evacuated him and the rest of the crew from their quarters in order to conserve deuterium. (VOY: "Demon")

In 2375, Lang was one of two security officers that watched Tom Paris when he was demoted to the rank of ensign in the captain's ready room. He and the other security officer grabbed his arms to escort him to the brig afterwards, but Tom pulled back, saying he knew the way. Later that month, while he was on guard in Paris' brig, the starship came under attack and the crew was called to battle station. Lang quickly ran out of the brig to his post, leaving Paris alone behind the force field. (VOY: "Thirty Days")

Lang was portrayed by regular background actor Sylvester Foster who received no credit for his appearances.

He was visually identified by name in the episode "Warhead". This character's first name and enlistedrank of "technician" were on the "Imperfection" graphic casualty list, not in any of his actual appearances.